CN210111606U - Air conditioner frequency converter power supply device and air conditioner frequency converter power supply system - Google Patents
Air conditioner frequency converter power supply device and air conditioner frequency converter power supply system Download PDFInfo
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- CN210111606U CN210111606U CN201922150104.1U CN201922150104U CN210111606U CN 210111606 U CN210111606 U CN 210111606U CN 201922150104 U CN201922150104 U CN 201922150104U CN 210111606 U CN210111606 U CN 210111606U
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Abstract
The utility model relates to an air conditioner converter power supply unit and air conditioner converter power supply system, this air conditioner converter power supply unit includes: the bidirectional DC/DC converter unit, the DC/AC converter unit and the energy storage unit; the bidirectional DC/DC converter unit is suitable for converting a front-end direct-current input voltage into a direct-current voltage with a corresponding grade and outputting the direct-current voltage to the DC/AC converter unit and the energy storage unit, namely the DC/AC converter unit is suitable for converting the direct-current voltage into an alternating-current voltage matched with the actual power of the air conditioner compressor and transmitting the alternating-current voltage to the air conditioner compressor; and the energy storage unit is adapted to deliver a voltage to the DC/AC converter unit; the utility model discloses a two-way DC/DC converter unit can realize direct current direct power supply, has still practiced thrift the energy when improving the practicality, has overcome and has needed through three group's converter units from subway contact net to air condition compressor in traditional frequency conversion air conditioner power supply topology, can not hundredth percent conversion energy cause the extravagant problem of energy because of every grade of converter unit.
Description
Technical Field
The utility model relates to an air conditioner converter power supply field especially relates to an air conditioner converter power supply unit and air conditioner converter power supply system.
Background
At present, the power supply voltages of electrical equipment in a subway vehicle are three types, namely DC1500V, AC380V and DC110V, wherein DC1500V is the voltage of a subway overhead line system, DC110V is the input voltage of control equipment of all the electrical equipment, and AC380V is the power supply voltage of equipment such as an air conditioner, a fan, a compressor and a charger. With the increasing tension of global energy supply trend, energy-saving and emission-reducing slogans are proposed by various industries. And the rail transit system has high power consumption and high running cost. The air conditioning system and the traction system are main loss sources of the rail transit vehicle, the loss of the air conditioning system accounts for more than half of that of the auxiliary system, and in order to reduce the loss, more and more subway vehicles use variable-frequency air conditioners to replace the conventional fixed-frequency air conditioners; the loss of the traction system mainly comes from the waste of electric quantity during electric braking.
The power supply topology adopted by the conventional inverter air conditioner is shown in fig. 1. It can be seen from the figure that the air conditioner power supply device is composed of an AC/DC converter unit and a DC/AC converter unit, and the front end input of the power supply device is an alternating current voltage which is generated by a front end DC/AC converter. An AC/DC converter unit in a traditional variable-frequency air conditioner power supply usually adopts a diode rectification topology; DC/AC units typically employ a three-phase half-bridge topology.
The diode rectifying device can greatly influence the quality of an output waveform of the front-end DC/AC unit, and can influence the efficiency and the service life of the front-end 380V output auxiliary converter; in the traditional inverter air conditioner power supply topology, three groups of converter units are needed from a subway overhead line system to an air conditioner compressor, and because each stage of converter unit cannot convert energy by hundreds, the overall efficiency of equipment is undoubtedly reduced, and energy is wasted; when the pantograph is in fault and power failure, the air conditioning unit cannot work normally, and riding experience of passengers is seriously influenced.
Therefore, it is desirable to develop a new power supply device and system for inverter of air conditioner to solve the above problems.
Disclosure of Invention
The utility model aims at providing an air conditioner converter power supply unit and air conditioner converter power supply system to need in overcoming traditional frequency conversion air conditioner power supply topology from subway contact net to air condition compressor through the extravagant problem of the energy that causes of three group's converter units.
In order to solve the technical problem, the utility model provides an air conditioner converter power supply unit, it includes: the bidirectional DC/DC converter unit, the DC/AC converter unit and the energy storage unit; the bidirectional DC/DC converter unit is suitable for converting a front-end direct-current input voltage into a direct-current voltage with a corresponding grade and outputting the direct-current voltage to the DC/AC converter unit and the energy storage unit, namely the DC/AC converter unit is suitable for converting the direct-current voltage into an alternating-current voltage matched with the actual power of the air conditioner compressor and transmitting the alternating-current voltage to the air conditioner compressor; and the energy storage unit is adapted to deliver a voltage to the DC/AC converter unit.
Further, the bidirectional DC/DC converter unit includes: a first stage conversion circuit and a second stage conversion circuit; the first-stage conversion circuit and the second-stage conversion circuit are connected in series; the first-stage conversion circuit is connected with a subway overhead line system, and the second-stage conversion circuit is connected with a load; when voltage flows into a load side from a subway contact network side, the voltage is subjected to voltage reduction and output to the load after passing through the first-stage conversion circuit and the second-stage conversion circuit in sequence; and when the voltage flows into the subway contact network side from the load side, the voltage sequentially passes through the second-stage conversion circuit and the first-stage conversion circuit and then is boosted to be supplemented to the subway contact network.
Further, the first stage conversion circuit includes: a half-bridge IGBT circuit; the second stage conversion circuit includes: an IGBT device VT1, an IGBT device VT4 connected in series with the half-bridge IGBT circuit; the voltage level output to the load is adjusted by controlling the operating state of the half-bridge IGBT circuit and/or the IGBT device VT1 and/or the IGBT device VT 4.
Further, the driving waveforms of the first stage conversion circuit and the second stage conversion circuit are different by 180 degrees.
Further, the energy storage medium of the energy storage unit can adopt a lithium titanate battery, a super capacitor or a lithium super capacitor.
Further, the air conditioner inverter power supply unit still includes: an emergency inverter unit; the emergency inverter unit is adapted to power the DC/AC converter unit when the bidirectional DC/DC converter unit fails.
On the other hand, the utility model provides an air conditioner converter power supply system, it includes: a plurality of parallel air conditioner frequency converter power supply devices; when the bidirectional DC/DC converter unit in any one air conditioner frequency converter power supply device fails, the bidirectional DC/DC converter units in the rest air conditioner frequency converter power supply devices are suitable for supplying power to the DC/AC converter unit connected with the failed bidirectional DC/DC converter unit.
The beneficial effects of the utility model are that, the utility model discloses a two-way DC/DC converter unit can realize the direct current direct power supply, has still practiced thrift the energy when improving the practicality, has overcome and has needed through three group's converter units in from subway contact net to air condition compressor in traditional frequency conversion air conditioner power supply topology, because of every class of converter unit can not hundred percent conversion energy cause the extravagant problem of energy.
Drawings
The present invention will be further explained with reference to the drawings and examples.
FIG. 1 is a power supply topology diagram adopted by a conventional inverter air conditioner;
FIG. 2 is a schematic block diagram of the power supply device of the inverter of the air conditioner of the present invention;
fig. 3 is a circuit diagram of a bidirectional DC/DC converter unit of the present invention;
FIG. 4 is a driving waveform diagram of IGBT devices in a bi-directional DC/DC converter cell;
fig. 5 is a schematic diagram of the power supply topology of the present invention;
fig. 6 is a schematic block diagram of the power supply system of the air conditioner inverter of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
Example 1
FIG. 2 is a schematic block diagram of the power supply device of the inverter of the air conditioner of the present invention;
in this embodiment, as shown in fig. 2, the present embodiment provides an air conditioner inverter power supply apparatus, which includes: the bidirectional DC/DC converter unit, the DC/AC converter unit and the energy storage unit; the bidirectional DC/DC converter unit is suitable for converting a front-end direct-current input voltage into a direct-current voltage with a corresponding grade and outputting the direct-current voltage to the DC/AC converter unit and the energy storage unit, namely the DC/AC converter unit is suitable for converting the direct-current voltage into an alternating-current voltage matched with the actual power of the air conditioner compressor and transmitting the alternating-current voltage to the air conditioner compressor; and the energy storage unit is adapted to deliver a voltage to the DC/AC converter unit.
In this embodiment, direct current direct power supply can be realized through two-way DC/DC converter unit to this embodiment, has still practiced thrift the energy when improving the practicality, has overcome in the traditional inverter air conditioner power supply topology need pass through three converter units in the subway contact net to the air condition compressor, because of the extravagant problem of energy that can not hundred percent conversion energy of every grade of converter unit causes.
Fig. 3 is a circuit diagram of a bidirectional DC/DC converter unit according to the present invention.
In order to convert a front-end DC input voltage into a corresponding level DC voltage and output the DC voltage to the DC/AC converter unit and the energy storage unit, as shown in fig. 3, the bidirectional DC/DC converter unit includes: a first stage conversion circuit and a second stage conversion circuit; the first-stage conversion circuit and the second-stage conversion circuit are connected in series; the first-stage conversion circuit is connected with a subway overhead line system, and the second-stage conversion circuit is connected with a load; when voltage flows into a load side from a subway contact network side, the voltage is subjected to voltage reduction and output to the load after passing through the first-stage conversion circuit and the second-stage conversion circuit in sequence; and when the voltage flows into the subway contact network side from the load side, the voltage sequentially passes through the second-stage conversion circuit and the first-stage conversion circuit and then is boosted to be supplemented to the subway contact network.
In this embodiment, the bidirectional DC/DC converter unit in this embodiment adopts a three-level flying capacitor topology, and the bidirectional DC/DC converter unit functions to convert DC1500V in a subway overhead line system into a voltage class required by a back-end energy storage unit or a DC/AC converter unit. When energy flows into a load side from a subway contact network side, the bidirectional DC/DC converter unit belongs to a step-down topology; when energy flows into the subway contact network side from the load side, the energy belongs to a boosting topology. The output voltage of the bidirectional DC/DC converter unit can be continuously adjusted to realize constant-current charging of the energy storage unit or soft start of the rear-end inverter unit and matching of the output voltage.
In this embodiment, as shown in fig. 3, the Ui terminal is connected to a subway overhead line system, and the Uo terminal is connected to a load.
Specifically, as an optional implementation manner, the first-stage conversion circuit includes: a half-bridge IGBT circuit; the second stage conversion circuit includes: an IGBT device VT1, an IGBT device VT4 connected in series with the half-bridge IGBT circuit; the voltage level output to the load is adjusted by controlling the operating state of the half-bridge IGBT circuit and/or the IGBT device VT1 and/or the IGBT device VT 4.
The first stage conversion circuit includes: the half-bridge IGBT circuit comprises a half-bridge IGBT circuit (an IGBT device VT2 and an IGBT device VT 3) and a bus capacitor C2, wherein the bus capacitor C2 is connected to two ends of the half-bridge IGBT circuit in parallel; the second stage conversion circuit includes: IGBT device VT1, IGBT device VT4 and busbar capacitance C1.
When the duty ratio d is less than 0.5, the IGBT device VT1 and the IGBT device VT2 are not closed at the same time; the bidirectional DC/DC converter unit is equivalent to a step-down topology circuit when the input voltage is Ui/2, and the current path when the bidirectional DC/DC converter unit is switched on is as follows: the voltage Ui passes through a smoothing reactor L1, an IGBT device VT1, a bus capacitor C2, an anti-parallel diode of the IGBT device VT3 and an output filter reactor L3, at the moment, the potential of the positive end of a bus capacitor C1 is Ui, the potential of the negative end of the bus capacitor C1 is Ui/2, and the voltage at two ends of the bus capacitor C1 is Ui/2; the devices through which the current flows when turned off are: the anti-parallel diode of IGBT device VT3, the anti-parallel diode of IGBT device VT4, and output filter reactor L3.
When the duty ratio d is greater than 0.5, namely the IGBT device VT1 and the IGBT device VT2 are closed simultaneously; the bidirectional DC/DC converter unit is equivalent to a voltage reduction topological circuit when the input voltage is Ui, and the current path when the bidirectional DC/DC converter unit is switched on has two types, one of which is as follows: the voltage Ui passes through a smoothing reactor L1, an IGBT device VT1, a bus capacitor C2, an anti-parallel diode of the IGBT device VT3 and an output filter reactor L3, at the moment, the potential of the positive end of a bus capacitor C1 is Ui, the potential of the negative end of the bus capacitor C1 is Ui/2, and the voltage at two ends of the bus capacitor C1 is Ui/2; the second is as follows: the voltage Ui passes through a smoothing reactor L1, an IGBT device VT1, an IGBT device VT2 and an output filter reactor L3, at the moment, the potential of the positive end of a bus capacitor C1 is Ui, the potential of the negative end of a bus capacitor C1 is 0, and the voltage at the two ends of the bus capacitor C1 is Ui; the devices through which the current flows when turned off are: the anti-parallel diode of IGBT device VT3, the anti-parallel diode of IGBT device VT4, and output filter reactor L3.
Fig. 4 is a driving waveform diagram of an IGBT device in a bidirectional DC/DC converter unit.
In order to complement the driving waveforms of the upper and lower tubes in the first stage converting circuit and the second stage converting circuit, as shown in fig. 4, the driving waveforms of the first stage converting circuit and the second stage converting circuit are different by 180 °.
Specifically, as an optional embodiment, the energy storage medium of the energy storage unit may adopt a lithium titanate battery, a super capacitor, or a lithium super capacitor.
Fig. 5 is a schematic diagram of the power supply topology of the present invention.
In order to improve the compatibility and the practicability of the air conditioner frequency converter power supply device, as shown in fig. 5, the air conditioner frequency converter power supply device further comprises: an emergency inverter unit; the emergency inverter unit is adapted to power the DC/AC converter unit when the bidirectional DC/DC converter unit fails.
Example 2
Fig. 6 is a schematic block diagram of the power supply system of the air conditioner inverter of the present invention.
On the basis of embodiment 1, as shown in fig. 6, this embodiment provides an air conditioner inverter power supply system, which includes: a plurality of air conditioner frequency converter power supply devices which are connected in parallel as provided by the embodiment 1; when the bidirectional DC/DC converter unit in any one air conditioner frequency converter power supply device fails, the bidirectional DC/DC converter units in the rest air conditioner frequency converter power supply devices are suitable for supplying power to the DC/AC converter unit connected with the failed bidirectional DC/DC converter unit.
In the present embodiment, the power supply device of the air conditioner inverter has been clearly described in the above embodiments.
To sum up, the utility model discloses a two-way DC/DC converter unit can realize the direct current direct power supply, has still practiced thrift the energy when improving the practicality, has overcome and has needed through three group's converter units in the traditional inverter air conditioner power supply topology from subway contact net to air condition compressor, can not hundredth percent conversion energy cause the extravagant problem of energy because of every class of converter unit.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (7)
1. An air conditioner inverter power supply unit, characterized by includes:
the bidirectional DC/DC converter unit, the DC/AC converter unit and the energy storage unit; wherein
The bidirectional DC/DC converter unit is adapted to convert a front-end DC input voltage into a corresponding level DC voltage and output the DC voltage to the DC/AC converter unit and the energy storage unit, i.e.
The DC/AC converter unit is suitable for converting the direct-current voltage into alternating-current voltage matched with the actual power of the air-conditioning compressor and transmitting the alternating-current voltage to the air-conditioning compressor; and
the energy storage unit is adapted to deliver a voltage to the DC/AC converter unit.
2. The power supply device of the inverter of the air conditioner according to claim 1,
the bidirectional DC/DC converter unit includes: a first stage conversion circuit and a second stage conversion circuit;
the first-stage conversion circuit and the second-stage conversion circuit are connected in series;
the first-stage conversion circuit is connected with a subway overhead line system, and the second-stage conversion circuit is connected with a load;
when voltage flows into a load side from a subway contact network side, the voltage is subjected to voltage reduction and output to the load after passing through the first-stage conversion circuit and the second-stage conversion circuit in sequence; and
when voltage flows into a subway contact network side from a load side, the voltage sequentially passes through the second-stage conversion circuit and the first-stage conversion circuit and then is boosted to be supplemented to a subway contact network.
3. The power supply device of the inverter of the air conditioner according to claim 2,
the first stage conversion circuit includes: a half-bridge IGBT circuit;
the second stage conversion circuit includes: an IGBT device VT1, an IGBT device VT4 connected in series with the half-bridge IGBT circuit;
the voltage level output to the load is adjusted by controlling the operating state of the half-bridge IGBT circuit and/or the IGBT device VT1 and/or the IGBT device VT 4.
4. The device for supplying power to an inverter of an air conditioner according to claim 3,
the difference of the driving waveforms of the first-stage conversion circuit and the second-stage conversion circuit is 180 degrees.
5. The power supply device of the inverter of the air conditioner according to claim 1,
the energy storage medium of the energy storage unit can adopt a lithium titanate battery, a super capacitor or a lithium super capacitor.
6. The power supply device of the inverter of the air conditioner according to claim 1,
the air conditioner frequency converter power supply unit still includes: an emergency inverter unit;
the emergency inverter unit is adapted to power the DC/AC converter unit when the bidirectional DC/DC converter unit fails.
7. An air conditioner inverter power supply system, comprising:
a plurality of air conditioner frequency converter power supply devices according to any one of claims 1 to 6, which are connected in parallel;
when the bidirectional DC/DC converter unit in any one air conditioner frequency converter power supply device fails, the bidirectional DC/DC converter units in the rest air conditioner frequency converter power supply devices are suitable for supplying power to the DC/AC converter unit connected with the failed bidirectional DC/DC converter unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922150104.1U CN210111606U (en) | 2019-12-05 | 2019-12-05 | Air conditioner frequency converter power supply device and air conditioner frequency converter power supply system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922150104.1U CN210111606U (en) | 2019-12-05 | 2019-12-05 | Air conditioner frequency converter power supply device and air conditioner frequency converter power supply system |
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| CN210111606U true CN210111606U (en) | 2020-02-21 |
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| CN201922150104.1U Active CN210111606U (en) | 2019-12-05 | 2019-12-05 | Air conditioner frequency converter power supply device and air conditioner frequency converter power supply system |
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